The enzyme, decarboxylase, catalyses the following step :
1. conversion of citric acid to cis aconitic acid
2. fumaric acid to malic acid
3. oxalosuccinic acid to $\mathrm{\alpha }$-ketoglutaric acid
4. malic acid to oxaloacetic acid

In which one of the following do the two names refer to one and the same thing : -
1. Krebs cycle and Calvin cycle
2. Tricarboxylic acid cycle and citric acid cycle
3. Citric acid cycle and Calvin cycle
4. Tricarboxylic acid cycle and urea cycle

The number of molecules of carbon dioxide produced by three turns of the Krebs cycle would be:

Coenzyme A, formed in part from one of the B vitamins, functions to:

In the citric acid cycle, a molecule of GTP is formed during the conversion of:
1. $\mathrm{\alpha }$ - ketoglutarate to Succinyl-CoA
2. Succinyl-CoA to succinate
3. Succinate to fumarate
4. Fumarate to malate

In the citric acid cycle: